Troubleshoot: Can't select mod part in VAB

[SirSnoopy]

Firstly, hands up; I'm a total noob when it comes to modding. I've learnt Blender and Unity basics in two days, and I'm basically just getting to grips with part production atm.

I have my first test piece (a simple 2x1 sheet) built and textured in Blender and im-exported with Unity to .mu/.mbm files.

O frabjous day! My beautiful part loads in the game, renders its texture correctly and the two nodes I assigned it in the .cfg are spot on! My problem is that as soon as the part is dropped/placed in the VAB it then becomes totally unselectable. I haven't got the slightest clue where to look for the source. Is it likely to be something I did wrong/overlooked in modelling, or a simple oversight in the .cfg?

[nli2work]

you forgot to assign collision mesh in Unity.

[SirSnoopy]

Oh my god. I feel like such a tit. Thank you.

[nli2work]

I lost count of how many times I did the same thing.